Quote:
Originally Posted by Tim
HamishBoxer isn't kidding. The only Eddystone I have had through my hands was very "deaf", mostly caused by those horrible little carbon comp resistors going OOT( mostly high-some very high). I must have changed about a dozen of them.
Check them all, especially the ones over about 10K, particularly if they are designed to have a reasonable potential across them.
Unfortunately some were very hard to get at, as they were under coil banks etc.
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Yes - on my 840A the local-oscillator didn't oscillate reliably above about 15MHz; initially I thought the triode of the ECH42 was getting tired but a new one made very little difference.
Replacing the 10K anode-feed resistor with one that actually measured 10K rather than 18K like the original brought things back to life! After that, I replaced quite a few more resistors (screen-feeds, anode decouplers) and the sensitivity improved significantly.
"Steady Eddy" is now my bedside radio - ideal for a bit of nighttime tuning-around when insomnia strikes!